* Introduce trait
* Implement VRFSigner in keystore
* Use vrf_sign from keystore
* Convert output to VRFInOut
* Simplify conversion
* vrf_sign secondary slot using keystore
* Fix RPC call to claim_slot
* Use Public instead of Pair
* Check primary threshold in signer
* Fix interface to return error
* Move vrf_sign to BareCryptoStore
* Fix authorship_works test
* Fix BABE logic leaks
* Acquire a read lock once
* Also fix RPC acquiring the read lock once
* Implement a generic way to construct VRF Transcript
* Use make_transcript_data to call sr25519_vrf_sign
* Make sure VRFTranscriptData is serializable
* Cleanup
* Move VRF to it's own module
* Implement & test VRF signing in testing module
* Remove leftover
* Fix feature requirements
* Revert removing vec macro
* Drop keystore pointer to prevent deadlock
* Nitpicks
* Add test to make sure make_transcript works
* Fix mismatch in VRF transcript
* Add a test to verify transcripts match in babe
* Return VRFOutput and VRFProof from keystore
Rakan Alhneiti